Apparatus for filtering



w.` H. FURNEss APPARATUS FOR FILTERNG Sept. l27, 1927. 1,643,299

Filed Deo. 6. 1924 f JNVENTOR v By ATTORNEY@ Patented Sept. 27, 1927.

UNITED STATES PATENT oFFicE-.x/

WILLIAM H. FURNESS, OF NATION/AL PARK, NEW JERSEY, ASSIGNOR TO CELLQCILK COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION F DELAWARE.

APPARATUS ron FILTERING.

Application filed December 6, 1924. Serial No. 754,254.

Thisinvention relates toa method of and an apparatus for filtering fiuids. t

One of the primary objects of the lnvention is to provide a simple and effective filter which is easy to assemble and take apart and inexpensive to manufacture.

Another object is to provide a filter in which the filtering element may be readlly removed either as a unit or in pieces, so

that the parts thereof may be thoroughly cleaned in a convenient manner and with a minimum of time loss.

Still another object is to rovide a filter through which the fluid may e passed under pressure without danger of destroying the filtering element.

Still another object of ythe invention 1s to provide a filter in which the particles to be removed are progressively filtered out 1n a series from larger to smaller soJ that removal of particles is effected overpan eX- tended area.

Still another object is the provision ofa filter which will function for 'la maximum period of time before it requires cleaning.

How these and other advantages can be realized through the invention will become apparent from the description hereinafter of the best embodiment known to me.

vation through a filter constructed in ac- ,.cordance with my invention.`

Fig. 2 is a plan view of the carrier member of the filtering element.

Fig. 3 is a plan vieiv of one of of the filtering element. l

, In Fig.' 1 -I have shown the vfilter vasv composed of 'a casing A and a filtering element or unit indicated as a Whole by the reference character B, the casing being provided with a pipe 7 through which the fluid to.be filtered is admitted and a pipe 8 through which the filtered fluid is delivered to the point of use. The casing Aas here shown is made up of the upper and lower castings 9 and 10 respectively it being understood. ofcourse that this construction does not form part of my invention and may be made in any number of different ways.

The filtering element B is securedr to the casing A in any suitable manner in this instance it is secured to the upper casting 9 by means of the threaded neck 11 on the the plates carrier l12 of the filtering element. 'Ihe car.-

' In the drawings Fig. 1 is a sectional ele-- rier 12 is provided with a plate like portion 13 and an extending shank or stud 14 adapted to receive a plurality of plates 15 which together with the carrier 12 comprises the filtering element or unit B.' The particular' construction and function of the plates forms an important partv of this invention and will Abe hereinafter more fully described. The

plates 15 are secured to the carrier by any suitable means, '.such as the nut 16 and washer '17. f

While I have shown five plates in the drawings it is to be understood that any number of plates may be used according tov the particular service for which lthe filter is intended. Insmall capacity installations even a single plate might be used in combination with the casing of the filter.

Reverting now to the construction of the plates'l for the filtering unitit will be seen that each plate is provided with .a flat central portion 18, surrounded by a tapering portion 19. As here shown the entire lower surface of the plate is fiat while the upper surface is flat only to the extent of the central portion 18 at which portion the plate is thickest. The upper surface of the portion 19 tapers toward the lower surface of the (lll plate from a point 2O slightly below the upper surface of the flat portion 18 to the periphery of the plate. If desired however both surfaces of the portion 19,may be tapered for purposes which wllbecome apparent hereinafter.y A yseries of holes 21 forming passages through the plates are provided adjacent the flat portion 18ther'eof.

lished by meansof a channel or groove 22 in the face ofthe plates.

To assemble the filtering-element or unit,

a number of plates 15 are mounted on the plate 15. Thusit will be seen that when f the unit is assembled the flat portions of the `Communication between the holes is estab-f plates abut and tapering spaces are provided between the tapering portionsv thereof. Statedinanother way spaces 23 are provided between the tapering ortions'ofl the plates 15 which flare outwar to the periphery, a slightl space being provided between' the plates adjacentk the central flat portion which` determines the degree to which filtering is effective.

thereof virtue of the taper flaring outward from a point sli htlybelow the upper,-V

most surface of the Ap ate. It isl this spacing vIn operation fluid' is admitted to the cas- I ing A through the `pipe 7 ,and ythen seeks its being directed against the flare, that is to lo way into the spaces 23 between the plates, it

say it enters the spaces at the peri hery --where the spaces are largest and is orced inward against the tapering surfaces there-` of and thence through the shallow slitlike s ace at 20 at the base of the are, through t e holes or passages 21, filllngl the channels or grooves 22 and nally through the pasl (large and small)4 collecting at the entrance i SeUTe tering -unit sieges or holes 24 in the carrier 12 into the lvery pipe' 8. In short the fluid is ad.

mitted eripherally of the filtering element and 'de ivered axially thereof through the] delivery pipe 8.A

An outstanding and important feature of my invention `i s the manner in which the .particles to be separated arel automatically ated according to size, the larger partidles ing eliminated nearest the inlet point while the smaller particles are free to on until-stopped at a point-where the decreasing size of the space no longer will allow themto passon.. Thus it will be seen that thefiilter will function for a 4maximum I periodv owing tol the particles becoming se regated'over an extended area instead ofa pointof the filtering element. It is also to beI pointed out that even after. a considerable number 'of the larger particles have collected at the entrance the smaller particles will find` their way through the voids between 4o-` the larger particles thereb ltly extending the effective .period o t e filter. lFor 'such reasons, together with -thefact thatthe fluid is admitted at the entire periphery of 'the filtering element thus presentin a large veie'ct ive 'area, clogging becomes on y a secondary consideratlon as compared to filters in use prior to my invention. .The convenient manner in which the filter be removed or' in fact the filplates 15 mag as a whole, makes `fer a, minipass mum loss of time when itis desired to clean the filter. The filter lunit B may be quickly removed by mser'tln a Spanner wrench inv the notches 25 provi ed"forthat pur ose in l' the carrier 12, and a newone inserte t'o replace it while it is beingcleaned. The units t can be inexpensively'manufactured `owing to' their simple construction so that. a numberv vthereof may be kept on hand with very little expense. Obviously. a filtering element constructed in accordance with my invention would havelongylife, 4there being no 1 lparts to break or chip olf 'andcarry through withthe fluid as is the case in lmany existing filters especially those `using -mass materials such as glass Wool for instance.A

. The plates'of the filter can be inexpensively replaced should they'become ineffective .from abuse or corrosion when usedfor filtering liquids containing acids. In such cases -however the life couldbe greatly extended by making the plates of special compositions. i

. The filter is that proper filtration 'fon such purpose is .effected by making the dimension of the slit like space approximately .001 and the space at the periphery'ap'proximately .010.

Ifcdesired, the plates maybe tapered in the opposite direction from that'shown in which case the fluid wouldenterl at the cenplates. The advantages realizedv from the particularly` useful in the 1 Iilterlng of viscous li uids used inthe man^ ufacture of artificial sllk. It has been found ter and be delivered at the periphery of. thetapering spaces as previously described establishing communication between the pas" 'l "WILLIAM H. rpnnnss. 

